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Basically you don't really want to do that straight into your controller. (loose coupling) I'd create 2 utils classes <code>Tree<T></code> and <code>Node<T></code> to manage your tree and nodes: Here is the tree class: <pre><code>public class Tree<T> { private Node<T> rootElement; public Tree() { super(); } public Node<T> getRootElement() { return this.rootElement; } public void setRootElement(final Node<T> rootElement) { this.rootElement = rootElement; } public List<Node<T>> toList() { final List<Node<T>> list = new ArrayList<Node<T>>(); walk(this.rootElement, list); return list; } private void walk(final Node<T> element, final List<Node<T>> list) { list.add(element); for (final Node<T> data : element.getChildren()) { walk(data, list); } } } </code></pre> And the node class with some helper methods <pre><code>public class Node<T> { private T data; private List<Node<T>> children; public Node() { super(); } public Node(final T data) { this(); setData(data); } public Boolean hasChildren() { return this.children.size() != 0; } public List<Node<T>> getChildren() { if (this.children == null) { return new ArrayList<Node<T>>(); } return this.children; } public void setChildren(final List<Node<T>> children) { this.children = children; } public int getNumberOfChildren() { return this.children.size(); } public void addChild(final Node<T> child) { if (this.children == null) { this.children = new ArrayList<Node<T>>(); } this.children.add(child); } public void insertChildAt(final int index, final Node<T> child) throws IndexOutOfBoundsException { if (index == getNumberOfChildren()) { addChild(child); return; } else { this.children.get(index); this.children.add(index, child); } } public void removeChildAt(final int index) throws IndexOutOfBoundsException { this.children.remove(index); } public T getData() { return this.data; } public void setData(final T data) { this.data = data; } } </code></pre> Then I'd have your type of tree extending the tree. based on your controller CourtBranch Suppose your CourtBranch model has the following structure (I'm using hibernate + jpa): <pre><code>@Entity @Table public class CourtBranch private String id; private String name; private Long partentId; //getters setters etc... </code></pre> Create a class that extends the Tree: <pre><code>public class CourtBranchTree extends Tree<CourtBranch> public CourtBranchTree{ super(); } </code></pre> Now create your TreeGridResponse class: <pre><code>public class TreeGridResponse { //inject the service to get the id of your model @Resource CourtBranchService cbService; //if you are using a repository for the db queries: @Resource CourtBranchRepository cbRepo; public TreeGridResponse(){ } //returning the tree as a JSON to use AJAX public String cbBTreeAsJson(final CourtBranchTree tree){ final StringBuffer sb = new StringBuffer(); final CourtBranch root = tree.getRootElement().getData(); sb.append("[\r {\"title\": \"" + root.getName() + "\", \"key\": \"" + root.getId() + "\", \"children\": [\r"); final List<Node<CourtBranch>> children = tree.getRootElement().getChildren(); loopforChildre(sb, children); sb.append("]"); return sb.toString(); } private StringBuffer loopForChildren(final StringBuffer sb, final List<Node<UserRight>> children) { for (int i = 0; i < children.size(); i++) { final Node<courtBranch> childElement = children.get(i); if (i == 0) { sb.append("{\"title\": \"" + childElement.getData().getName() + "\", \"key\": \"" + childElement.getData().getId() + "\""); } else { sb.append(", {\"title\": \"" + childElement.getData().getName() + "\", \"key\": \"" + childElement.getData().getId() + "\""); } if (childElement.hasChildren()) { sb.append(", \"children\": [\r"); loopForChildren(sb, childElement.getChildren()); } else { sb.append("}"); } } sb.append("]}"); return sb; } public CourtBranchTree get() { final CourtBranchTreetree tree = new CourtBranchTree(); final Node<CourtBranch> root = new Node<CourtBranch> (this.cbRepo.findOne(Long.valueOf(1)));//gets your root getRecursive(root, tree); tree.setRootElement(root); return tree; } private void getRecursive(final Node<CourtBranch> courtBranch, final CourtBranchTree tree) { final List<CourtBranch> children = this.cbService.findCourtBranchByParentId(courtBranch.getData().getId()); final List<Node<CourtBranch>> childElements = new ArrayList<Node<CourtBranch>>(); for (final CourtBranch childCourtBranch : children) { final Node<CourtBranch> childElement = new Node<CourtBranch>(childUserRight); childElements.add(childElement); getRecursive(childElement, tree); } courtBranch.setChildren(childElements); } } </code></pre> Register the TreeGridResponse in your config to get the bean and inject it into your controller. <pre><code>@Controller public class CBController @Resource private TreeGridResponse gridResponse; @RequestMapping(value="/CourtBranch/LoadTreeView", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE) @ResponseBody public String cbTree() { return this.gridResponse.cbBTreeAsJson(this.gridResponse.get()); } </code></pre> Note the @ResponseBody annotation that will indicate Spring to parse your string into JSON so that your AJAX can read it. And your jsp: <pre><code><div id ="cbTree"></div> <script type ="text/javascript"> $(function(){ $("#cbTree").dynatree({ initAjax:{ url: /CourtBranch/LoadTreeView }, checkbox: true, selectMode: 3 }); }); </script> </code></pre> Hope this helped...
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